of reactions by which triphenylmethane is converted into para-
rosaniline may be represented as follows : —
C8H5 /CJ-T4NOo /C«H4NH0 /CGH4NH.,
C«H0 -> UC(- C6H4NO.", -> HC(-C6H4NH,; (HO)C(-C6H4NH;
Triphenylmethane. Trin;;rethanPehenyl" • Paraleucaniline. Pararo^niline
By the action of hydrochloric acid on the base, the hydro-
chloride of pararosaniline is formed, which is the soluble'
HO.C(G;ll4NIT2)o + IIC1 = C(Ct!TI4NHo):>Cl H- H2O.
The constitution of the hydrochloride is doubtful ; but the
so-called quinonoid structure, by which the substance is repre-
sented as a derivative of quinone, is generally accepted,
The formation of rosaniline from a mixture of aniline, o- and
//-toluidine is represented by assuming that the methyl-group
of /-toluidine acts as the link which connects the nuclei of
aniline and ^-toluidine.
IIC ill II C(5lI4NUo + 30 = HO-C^C6H4NHa + 2H,O
Benzaldehyde Green.—-The formation of malachite
gre^n (benzaldehyde green) by the action of benzaldehyde